Is this Normal - XS Charging at 15.6 v

DIY
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1

I have an Orion XS with BMV-712 and LiTime 12v 320Ah battery. I noticed the XS was charging at 15.6 volts in bulk mode when set to 50 amp max charging. It’s configured to charge at 14.4v. When I cut back charging current to 25 amps voltage dropped to 14.5v.

At first I thought I might have a problem, then I thought the voltage was increased because of the loss over the cables (probably around 18 - 20 ft one way, factory 6 awg cable).

Am I correct that the voltage is increased to compensate for the los over the cable?

Thanks in advance, Mark

2

For something to charge there has to be a higher potential.
That being ssid the voltage drop will be high.

I would be more concerned if the litime was receving a higher voltage at its actual terminals. So thats really where you want to be measuring

3

If the BMV and Orion are in Bluetooth Smart Network together, or DVCC is setup on a GX device then the Orion can use the battery voltage from the BMV to compensate for cable losses. Otherwise is should control the Orion output terminals to 14.4V.

4

Like LX already says; the high voltage output of the XS is not a problem during bulk charging. The XS voltage is NOT the Litime voltage. As long as the voltage of the Litime does not reach that high voltage, there is not a problem. Probably the XS is raising it’s voltage this high to be able to charge with 50A. Best way indeed is to make a network and let the Orion measure the voltage of the battery by the shunt voltage, which tells a lot more about the real battery voltage then the output of the XS.

5

Exactly. Which is why the bmv should be as close to the battery as possible.